Section 1: Forces and Motion Flashcards
What does the gradient on a distance-time graph tell you
the speed
what does a flat section on a d-t graph tell you about the objects movements
it has stopped
what does the gradient on a speed-time graph tell you
acceleration
mass is measured in… using a…
g/kg etc. measured using a mass balance/scales
weight is measured in… using a …
Newtons (N) using a spring balance or a newton meter
which is a force: mass or weight?
weight
In what direction does the reaction force act? and which forces does it act against?
acts straight upwards, counter-acting the force of gravity/weight
HOW CA YOU REDUCE FRICTION between solid surfaces?
by putting a lubricant eg. oil/grease between the surfaces.
How can you reduce resistance/drag from fluids? (liquids/gases)
streamlining the object
what happens to the frction as the seed increases?
it increases
What factors could affect the motion of a toy car on a ramp? (4)
- Mass
- friction- is the surface a rug or a wooden plank?
- acceleration due to gravity- higher/lower up the ramp
- angle of ramp
objects reach terminal velocity when which forces are equal?
accelerating force and resistance.
terminal velocity of a falling object depends on its…(2)
shape and area
affect of n increased surface area on drag?
increased drag
affect of increased drag on terminal velocity?
decreased
affect of bigger mass on acceleration?
smaller acceleration
affect of bigger force on acceleration/deceleration?
greate
what do vectors represent? (2)
Size and direction
What do scalar quantities represent? (1)
Size
Examples of physical quantities that are vector quantities? (4)
any from force/velocity/displacement/acceleration/momentum
How (roughly) do you work out resultant force?
by combining vectors
which factors affect total stopping distance? (2)
thinking distance and braking distance
Which factors affect thinking distance? (2)
Speed and how dopey you are e.g tiredness, drugs, alcohol, old age, inexperience
Which factors affect braking distance? (4)
Speed, mass of vehicle, how good the brakes are, how good the grip is eg. road surface/weather/tyres
